I am just getting into studio photography and I picked up some older equipment. One item is a Compact Flash 1200 that I think was made by Hensel back in the 1980's. It works fine by pressing the test button, but doesn't seem to have an optical eye or normal sync cord plug in.

At the back where the switches are there is a space titled "INT" that a German friend said may mean trigger, but wasn't sure. Is this for a syncs cable? If so, what do I use? How can I buy on?

Also, I wonder if there isn't a slave eye that I could add. The second photo shows a screw in hole at the top near the rear of the unit. Is that for an optical slave eye? How might I install one?